How To Check Which Ports Are Open On Windows

Go to start Menu
Type CMD
Run as Administrator
Type netstat -ab (this command will identify open ports)
Wait for the list to load Ports name next to each IP address
Here you can find the port your are looking for. In the state column it's says LISTENING, it means this port is open.
This last digits is port Number
You can also use one more command to identify ports more clearly
Type in command Prompt netstat -aon
Here is the Active Connections list in five columns clearly showing details
In the Local Address you can see Port Number Exp: 0.0.0.0:445. after Colon (:) it's showing ports Numbers
In the State Column it's saying LISTENING it means this port is open
Exp: To find which application is using this 445 port note-down PID (Process ID)
After Note PID open Task Manager by pressing the Key Ctrl+Shift+Esc it will open Task Manager
Now go to Services tab to see all processes on your Windows
In Description column you can see which application is using port